Dee Cast was purely a last-gen idol at the time this comic was written, but she isn’t wrong in that she can still do this. MobyGames lists singles for her released that are as recent as 2018!

Three classic Dee Cast singles are referenced in the second panel: either ChuChu Rocket! or (more likely) Space Channel 5 (the dancing), Seaman (the fish), and Skies of Arcadia (the one she’s holding). The first two singles are the same in Japanese, but instead of Skies of Arcadia/Eternal Arcadia, Dee Cast was originally holding Rent A Hero No. 1.